using System;

public class Program

{

    public static void Main()

    {

        // Declare variable to foo

        var output = "foo";

        // Reverse it!

        var result = ReverseString(output);

        // Shis should print oof to the console

        Console.WriteLine(result);

    }

    public static string ReverseString(string s)

    {

        // You'll need to do something in here to get it to work

​

        return s;

    }

}